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local-storage

2.0.0 • Public • Published

local-storage

A simplified localStorage API that just works

Install

Using npm

npm install local-storage --save

Using bower

bower install localstorage --save

API

The API is a simplified way to interact with all things localStorage. Note that when localStorage is unsupported in the current browser, a fallback to an in-memory store is used transparently.

For that reason, consider that local-storage values might evaporate across page views.

ls(key, value?)

If a value argument is provided, acts as ls.set. When value isn't provided, acts as ls.get.

Example
var ls = require('local-storage');
 
ls('foo');
// <- null
 
ls('foo', 'bar');
// <- true
 
ls('foo');
// <- 'bar'

ls.get(key)

Returns value under key in local storage. Equivalent to ls(key). Internally parses the value from JSON before returning it.

Example
var ls = require('local-storage');
 
ls('foo', 'bar');
// <- true
 
ls.get('foo');
// <- 'bar'

ls.set(key, value)

Persists value under key in local storage. Equivalent to ls(key, value). Internally converts the value to JSON.

Returns whether the action succeeded; otherwise, an error was thrown by the browser when trying to persist the value. Failure typically means a QuotaExceededError was thrown.

Example
var ls = require('local-storage');
 
ls.set('foo', 'bar');
// <- true
 
ls.get('foo');
// <- 'bar'

ls.remove(key)

Removes key from local storage. Returns true if the property was successfully deleted, and false otherwise.

Example
var ls = require('local-storage');
 
ls.set('foo', 'bar');
// <- true
 
ls.remove('foo');
// <- true

ls.clear()

Clears local storage.

Example
var ls = require('local-storage');
 
ls.set('foo', 'bar');
ls.set('baz', 'tar');
ls.clear();

ls.backend(store?)

If a store argument is provided, it sets the backend storage engine. Otherwise it returns the current backend.

Example
var ls = require('local-storage');
 
ls.backend(sessionStorage);
ls.set('baz', 'tar');
/* close the tab, then reopen */
ls.get('baz');

ls.on(key, fn)

Listen for changes persisted against key on other tabs. Triggers fn when a change occurs, passing the following arguments.

  • value: the current value for key in local storage, parsed from the persisted JSON
  • old: the old value for key in local storage, parsed from the persisted JSON
  • url: the url for the tab where the modification came from
Example

Open a page with the following snippet in multiple tabs. The storage event will trigger on all tabs except for the one that persisted the change.

var ls = require('local-storage');
 
ls.on('foo', storage);
ls.set('foo', 'bar');
 
function storage (value) {
  console.log('some other tab changed "foo" to ' + value);
}

ls.off(key, fn)

Removes a listener previously attached with ls.on(key, fn).

Example
var ls = require('local-storage');
 
ls.on('foo', storage);
ls.off('foo', storage);
 
function storage (value) {
  console.log('some other tab changed "foo" to ' + value);
}

Typescript

Example
import ls, {get,set} from "local-storage";
 
set<number>('foo',5);
get<number>('foo');
 
interface IFoo{
  bar: string;
}
 
ls<IFoo>('foo');
Example
import * as ls from "local-storage";
 
ls.set<number>('foo',5);
ls.get<number>('foo');
 

License

MIT

install

npm i local-storage

Downloadsweekly downloads

22,476

version

2.0.0

license

MIT

homepage

github.com

repository

Gitgithub

last publish

collaborators

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